A cobpobation



L. N. STAGY.

INCINERATOR.

APPLICATION msn MAY lo. 1915.

Patented Sept. 9, 1919.

2 S MEETS- E. N. STACY.

INCINERATOR. APPLICATION min MAY10'.19|5.

Patented Sept. 9, 1919.

2 SHEETS-SHEET 2 UNITED sTATEs PATENT oEEIoE.

ELMEB N. STACY, OF MINNEAPOLIS, MINNESOTA, ASSIGNOR TO DECARIEINCINERATOR COMPANY, OF MINNEAPOLIS, MINNESOTA; A CORPORATION.

INCINERATOR.

Specification of Letters Patent.

Patented Sept. 9, 1919.

Application led May 10, 1915. Serial No.- 27,237.

To aZZ whom t may concern:

Be it known thatI I, ELMER il. STACY, citizenof the United States,resident of Minneapolis, county of Hennepin, State of Minnesota, haveinvented certain new and useful Improvements in Incinerators, of whichthe following is a specification.

The object of my invention is to provide improved means for utilizing aforced draft to be directed through the grate and combustion chamber ofthe incinerator, with improved means for pre-heating the air beforereaching said chamber.

A further object is to provide improved means for app ying a suction orinduced draft through the iiues leading from the combustionchamber,'these dra-ft appliances being active or inactive, as desired,and operalble independently of one another.

A further and particular object is to provide means for introducing avolume of pure air into the products of combustion flue to -mix with thehot gases and promote and accelerate the combustion thereof.

The invention consists generally in va- A ratus,

Fig. 3 is a vertical sectional view on the line wof Fig. 1, and a--z ofFig. 2, and

Fig. 4 is a similar view on the line y--jz/ of Fig. 1, also looking inthe direction of the arrow.

In the drawing, 2 represents the wall of the building in which theincinerating apparatus is located, and 3 is the incinerator proper,having a combustion chamber 4 wherein the header 5 and circulating pipes6 are arranged. v Beneath the header are the grates 7 having pits 8, 9and 10 beneath them, separated by partitions or walls 1l. A licor 12forms the bottom of these pits and beneath this floor I provide achamber 13.

Adjacent to the combustion chamber is a chamber 14 wherein thepre-heater is arranged, composed of flue sheets 15 and tlues 16 betweenthese sheets. A cold air intake trunk 17 leads through the wall of thebuilding to the space between the flue sheets 15 and a trunk 18communicates with this space and with a force fan 19 which in turncommunicates through a passage 20 with the chamber 13 (Fig. By means ofthis fan the cold air is dra-wn in through the pipe 17, circulates amongthe flues 16 and is delivered in an' expanded heated condition to thechamber 13. From this chamber pipes 21 extend to the pit 10 and trunks22 lead from the chamber 13 to the pits 8 and 9 and through these pipesand trunks a volume of heated air will be forced through the crate barsand into the 'combustion chamber to form a forced draft and hastencombustion. I also provide a pipe 22 leading upwardly from the passage20 and having depending ends 22l for discharging heated air into themixing chamber 23 adjacent to the passage through which the products ofcombustion flow from the chamber 4. This heated air lmixes with theproducts of' combustion in the chamber 23 and promotes and acceleratesthe combustion of the heated gases. I regard this arrangement fordelivering the volume of air to the flue and the hot gases as animportant feature of my invention.

A mixing chamber 23 is provided in the rear of the combustion chamberand communicates therewith through a passage 24, and a checkered wall 25separates the chamber 23 from the chamber 26. The checkered wall willbecome incandescent in the operation of theincinerator and aidmaterially in accelerating combustion of the hot gases mixed with thefresh air and coming in contact with this wall. From this chamber 26 a4liuc 27 having a damper 28 therein opens into a flue 34 which leads tothe stack flue 38. A passage 30 (Fig. 4) leads from the chamber 26 intothe chamber 14, sufficient space being provided in the bottom of thischamber to allow precipita-tion of ashes and soot. The gases andproducts of combustion from the chamber 14 pass through the fiues 16 toa chamber 31 (Figs. 2 and 4) above these flues which communicatesthrough a trunk 32 with a suction or induced draft fan 33 from which atrunk 34 leads to the stackilue 38 of the stack 29. A valve 35 4isprovided in the trunk 32 for shutting off the passage therethrough, anda trunk 36 (Fig.

2) leads from the chamber 31 to the stacklue v38 of the stack and isprovided with a valve 37 which, when opened, allows the products ofcombustion to flow directly to the stack through the stack-flue 38without passing to the fan 33.

With the foregoing described apparatus I am able to utilize the hotgases for pre-heating the incoming cold air before its delivery to thelower part of the combustion chamber and at the same time I can delivera quantity of this air to the products of combustion flue to mix withthe gases therein and eiect a more perfect combustion thereof. I am alsoable by `means of the suction fan to establish an induced draft andIaccelerate the flow of the products of combustion from the incinerator.When preferred, the natural draft may be utilized, the products ofcombustion passing directly to the stack.

In-various ways the details of construc-y tion herein shown anddescribed may be modified andstill be within the scope of my invention.

I claim as my invention:

chamber, a mixin chamber, and an outlet from the former discharging intothe latter,

a preheater having a cold air intake, a blast fan mounted to receive airfrom said preheater, an air trunk leading from said fan to the lowerportionA of said combustion chamber and having a branch leading to saidmixing chamber for mixing air with the heated gases, a, iue, havingcommunication with the mixln chamber and leading to a stack, and a va vecontrolled exit flue in indirect communication with the mixing chamberthrough the preheater..

2. An incinerator having a combustion chamber, a mixing chamber, and anoutlet from the former discharging into the latter, a preheater having acold alr intake, a blast fan mounted to' receive air from saidpreheater, an air trunk leading from said fan to the lower portion ofsaid combustion Ychamber and having a branch leading to 'said mixingchamber for mixing air with the heated gases, a flue, having a damper,in communication with the mixing` chamber and leading to a stack, avalve controlled a damper, in

exit flue in indirect communication with the from the former discharginginto the latter,

apre-heater having a cold air intake, a blast fan mounted to receive airfrom said preheater, an air trunk leadingV from said fan to the lower`portion of said combustion chamber and having a branch leading to saidmixing chamber for mixing air with the heated gases, a checkered wall insaid mixing chamber, a flue having a damper and incommunication with themixing chamber for the direct passage of products of combustion to astack without passing through the preheater, an exit iiue in indirectcommunication with the mixing chamber through the preheater, and asuction fan for said exit flue.

4. An incinerator having a combustion chamber, an outlet for theproducts of com bustion and a mixing chamber into which the products ofcombustion discharge, a preheater in communication with the mixingchamber and having a cold air intake, a blast fan mounted to receive airfrom said preheater, an air trunk leading from said fan to the lowerportion of said combustion chamber, and a branch pipe leading from saidair trunk and having downwardly turned end portions for dischargingheated air into said mixing chamber.

5. An incinerator having a .combustion chamber, a mixing chamber, and anoutlet from the former into the latter, a preheater in communicationwith the mixing chamber,

a blast fan and air conduit for transmission of air from the preheaterto the lower portion of the combustion chamber, a flue, having a damper,in communication with the mixing chamber and leading to a stack, a

lue,vhaving a damper, and leading from the 9.

preheater to a stack, and a valve controlled exit flue in indirectcommunication with the mixing chamber through the preheater and providedwith a suction fan.

In witness whereof, I have hereunto set l my hand this 4th day of May1915.

ELMER N. STACY.

'lli

